Upright exercise bike



FIG. 1 is a perspective view of the front of the upright exercise bike.

FIG. 2 is a perspective view of the rear of the bike.

FIG. 3 is a rear view of the bike.

FIG. 4 is a front view of the bike.

FIG. 5 is a top view of the bike; and,

FIG. 6 is a right side view of the bike, with the left side view being a mirror image thereof.

The broken line portions of the bike are for illustrative purposes only and form no part of the claimed design. 

The ornamental design of an upright exercise bike, as shown and described. 